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ICD-10 diagnosis code

G91.9 Hydrocephalus, unspecified

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G91.9 is the ICD-10 code for Hydrocephalus, unspecified. It is a four-character subcategory of G91 (Hydrocephalus), the most specific level in the WHO edition. It belongs to the block G90–G99 (Other disorders of the nervous system) in Chapter VI, Diseases of the nervous system.

Code type
Subcategory (4 characters)
Chapter
VI · G00–G99
Classification
WHO ICD-10, 2019 version

G91.9 in national editions

Countries report with their own edition of ICD-10. Most keep the WHO code and add more specific codes beneath it.

SwedenICD-10-SE

G91.9Hydrocefalus, ospecificerad

NorwayICD-10-NO

G91.9Uspesifisert hydrocephalus

DenmarkICD-10-DK

DG919Hydrocefalus UNS

FinlandICD-10-FI

G91.9Määrittämätön vesipäisyys

GermanyICD-10-GM

G91.9Hydrozephalus, nicht näher bezeichnet

FranceICD-10-FR

G91.9Hydrocéphalie, sans précision

NetherlandsICD-10-NL

G91.9hydrocefalie, niet-gespecificeerd

United StatesICD-10-CM

G91.9Hydrocephalus, unspecified

Based on the World Health Organization’s International Statistical Classification of Diseases and Related Health Problems, 10th revision (ICD-10), 2019 version, and the national editions published by each country’s health authority. This page is a reference, not coding advice; follow your national coding rules when you report.

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